Hacksaw-frame.



C. SPRAGUE.

HACKSAW FRAME.

APPLICATION men MAR. 12. 1916.

LWUAW. Mtented Jul 11, 1916.

enrrron sentence, or sr. LOUIS, rarseonr.

HACKSAW-FEAME.

macaw.

Epcolfication of Letters JPatent.

Patentedlll uly 11,11913.

Application filed Marchlt, 1918. serial No. 84,931.

T 0 all whom it may concern Be it known that I, Cmrrono SPRAGUE, acitizen of the United States, residing at St. Louis, State of Missouri,have invented new and useful Improvements in Hacksaw- Frames, of whichthe following 1s a specification.

This invention relates to improvements 1n hack saw frames and hasparticular appllcation to an adjustable frame.

In carrying out the present inventlon, 1t is my purpose to provide ahack saw frame which may be shortened and lengthened to fit saw bladesof different lengths and wherein the saw blades may be ad usted towardand away from the outer ends of the legs of the frame so as tofacilitate the use of the saw. 0

It is also my purpose to provlde a hack saw frame wherein the saw blademay be readily and conveniently apphed to the frame and detachedtherefrom and whereln the component parts of the frame Wlll be soarranged and correlated as to reduce the possibility of derangement to aminimum.

With the above and other ob ects 1n v ew, the invention consists in theconstructlon, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claims.

In the accompanying drawing; Figure 1 is a view in side elevation, partlin section, of a hack saw frame constructe in accordance with my presentinvention, the saw blade being shown in position. Figs. 2 3, 4 and 5 areviews of details of the inventlon.

Referring now to the drawing in detall, 1

designates a substantially II-shaped hack saw frame embodying a centralmember 2 and legs 3, 3 arranged at right angles to the central memberand spaced apart in parallelism. The central member 2 of the frame isformed of two longitudinally adjustable overlapping sections 4 and and,in the present instance, the overlapping end of the section 5 is formedwith an outwardly projecting lug 6 carrying a pin 7 normally engagingthe inner edge of the sectlon 4, while formed in the inner edge of thesection 5 and spaced apart suitable distances are notches 8 adapted toengage a pin 9 carried by the overlapping end of the section 4. By meansof this construction, it will be seen that the sections 4 and 5 may beswung rela tively to each other to disengage the particular notch 8 fromthe pin 9 and the sections adjusted to vary the length of the frame andwhen the frame has been adjusted to the desired length the section 5 isswung to engage the particular notch 8 with the pm 9, the pins 9 and 7cooperating to hold the sections in adjusted position.

In accordance with my present invention, the outer edge of one leg 3 isformed with notches 10 spaced apart longitudinally of such leg, whilethe other leg 3 is bifurcated for the major portion of its length as at11 and formed in the outer edges of the limbs of the bifurcated portionare notches 12 ipaced apart longitudinally of the leg.

ounted upon each leg 3 is a collar 13 ca pable of sliding movement alongthe leg and formed on the inner surfaces of the collars 13 contiguous tothe outer edges of the legs are teeth 14 adapted to engage the notchesin the legs to hold the collars in adjusted position on the respectivelegs. Interposed between the inner surfaces of the collars 13 and theinner edges of the respective legs are leaf springs 15 that act to holdthe teeth on the collars in engagement with the corresponding notches sothat accidental longitudinal movement of the collars along the legfswill be prevented.

assed through the collar 13 on the bifurcated leg and between the limbsof such bifurcated leg is a screw shank 16 and threaded onto the outerend portion of the shank is a nut 17 and also threaded upon the outerend portion of the shank beyond the nut 17 is a handle 18. The inner endortion of the shank 18 is preferably divided into longitudinalstationary and movable sections 19 and 20 respectlvely placed in face toface contact and formed on the flat face of the stationary section is apin 21, while formed in the movable section is an opening 22 adapted toreceive the pin 21. Threaded onto the shank and surrounding the sections19 and 20 is a securing collar 23 acting to hold the sections in shankformation and adapted to release such sections so that the movablesection may be removed from the stationary section when it is desired todetach the saw blade from the frame. Formed on the inner side of thecollar 13 on the leg 3 remote from the shank 16 is an inwardlyprojecting block 24 undercut at its inner end as at 25 and provided witha fiat surface 26 contiguous to the undercut. The Hat surface 26 isprovided with a pin 27 that cooperates 7 blade may be moved toward orawaygfrom the central member of the frame and when the collars are inthe desired positions the teeth 14 engage the adjacent notches 10' tohold the saw blade against accidental movement.

, While I have herein shown and described the preferred form of myinvention by way of illustration, I Wish it to be understood that I donot limit or confine myself to the precise details of constructionherein described and delineated, as modification and variation may bemade within the scope of the claims and without departing from thespirit of the invention.

I claim: 1. A hack saw frame of substantially U-form having one of thelegs thereof bifurcated, collars carried by said legs and adjustablelongitudinally thereon, shank passed through one of said collars andbetween the limbs of said bifurcated leg, and blade holding meanscarried by saidl shank and the remote collar respective y. i

2. A hack saw frame of substantially U-form having one of the legsthereof bifurcated, collars carried by said legs and acljustablelongitudinally thereon, a securing shank passed through one of saidcollars and between the limbs of said bifurcated leg, a nut threaded onsaid shank and bearing against said collar whereby the shank may bemoved longitudinally to tension the blade, and blade holdingmeanscarried by said shank and the remote collar respectively.

In testimony whereof I aflix my signature in presence of two witnemes.

CLIFFORD SPRAGUE.

a secu'ring :1

